Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdbc692542589ac5fe21b53ba41e8d637bbc3eefc014124f9aef1edf28ea9278' 
  AND token = 't9IjmPb3zdv3xn/DsuyjzxolcrdWCqG6NpF7ATMqrXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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