Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a61f4d748498e62dc1188e17801d4aef393760674460becacfec516c18bca694' 
  AND token = 'dH5aMFsIi1aVVJ9sbnt/0HHCvkVb6MkfOs3f1ik+LTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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