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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'ccca9e4712eca32eca5e83b03b35d6475f5b693555cc4a92fbf9034ad97eb2d2' 
  AND token = '+zEs8PfB3GJrNB1L67jmFzL9Mxenn7CNR+gUkTHFzQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}