Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a27bd95da1fea8c400d69dda8845b4a8dbfe87028b4554a1e98c4f6be9e5b770' 
  AND token = 'pfQV/j5BczuBJH8+X6dgRj3HNAeFRT96ffbBQRVUc9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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