Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c482acedfee202bf1449b0978e342d6c98734cd0161d86fe895ff7272b29cc84' 
  AND token = 'UmCazkPBSsJ5xRKtV0p5AkIfn5NizzUD0Us+Xau7nxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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