Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b7bd2f758d33089e23bedc1dcbf4858cb14d0a7f270def3a2ccef5934af9be' 
  AND token = 'NDCQ9VB8t9NSaGJ2jGarhqTziCQGuqvomVYXqaE/qTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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