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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '78d60cd7eda903c62fbd46296ec058aa65caf45b54a6c48653a9a55e8e1c08e7' 
  AND token = 'ncZvHUjeRbuDIjqE1Umk2qMeNGoJDYvQOe0Yyaa4NlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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