Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd538fc987535dfc7973c2ea8282e0ced7e132f67ac8a5cd2fe2a9146d9793f84' 
  AND token = 'rK8sRb3RA+w6AImD1IEefXfC2T1hLbeFzBvxPUIwd6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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