Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '208c2554bd70cba3b2670e7359220f3dcb2804f97b8b631403f0067ea1b0b2ed' 
  AND token = 'OpQpBrGA2q0YriZYHz3VRmmtel/9xi2iF5hoQ+VrKxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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