Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2fb1c5c7f8479217e6fef6ce85e102d9423e8a59ceee4617d080864f752a38d' 
  AND token = 'Wk9IP4deNMyLEnWhkVbvpt3Sy+ImiKMtAUuBVZVPLHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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