Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '851e27939da784d66e35e77f23d32dc756f50f7803546137e0b76cd7b06e7bdf' 
  AND token = '8uguo3coQVkSw0w+Kxb4h3mQWrZrHI8KuQ1FJbiEoBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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