Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2048d7113d842998ab4f1cdd1db5d02bb74dc2ffb078b1a709a9a6b75ad799d' 
  AND token = '8U/U9ol4bQD17KWOMkFdQPB+RKvmBYePHhCa3RNCllQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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