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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '12048d8cc962928812b05e36fdfb0c10133372d2d72d6bd7aeff44670c084163' 
  AND token = 'TfGpOYNRSQfQ3jLOF3gaqR73ie2gxcPlTwKyeK56T2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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