Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c6005f9e86d8888fd62b6fb53e74193fcfd6ae20acfaa6bdcc629e3490c597' 
  AND token = 'TQn0ACuyfvWJexKVAaypHDD7PNzGo8wOqSEuMe3OZHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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