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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '8fd2cdf9af711294c7d8cca53f7b9127415b19da5a3cff52a81e0300226d09d6' 
  AND token = 'neKLtRJfAR5hElpF67vkdLEn/urtiVdV0MOd5+lrLMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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