Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7cacc158ea74a5bbdda64e8e7fc1e155c269cb38252aac9783a05fd7896eb94' 
  AND token = 'D6oHzzeI3l1C9XLtiKgwLLar+zLCTPGoPcCpMUnOchs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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