Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59fca8f8478e5e6aa90be33c250f8bb4d738672996b4767778db30f3864f3731' 
  AND token = '5u3W5UyVaTGAgMsoAR4i5T2w3uWcJesk5kaPzNjnC5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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