Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3de025dd5c926c55e70a0413c9e921ce9f7043f8442cca9fb78e1f1192707fea' 
  AND token = '6zDYwhgzTXGkiDUFCmKsWhkYpUlfktOkcfEEe3vUL8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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