Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f51610babdf4ba9988dc7f199df38a3b4fcaa7cb83dfe0e2c361985bdd4198' 
  AND token = '3NZcyexZbw9z6f78kpfi5XcLYH/NgqKe6q+PSrWyRb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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