Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb320b7b2aeecf2d157d4f6664995db34448238d270990a8bdc3f052d47ec2e6' 
  AND token = 'EB0g9028+spH7vv9KNcZzAkKZ2Ngl1FPzhw7bd5ZF6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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