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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '51072b7a69bcc45cf5b177486340e2bee1a384f65c65352f501c408328f7a9b0' 
  AND token = 'zexgak8qU/5PbfMReWZ7N7Y385bNwD7zEPXeuJmNhf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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