Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '578b5dca581887f2d61e0d3f2af9579df2159c80dc0c748e62ee4323d1c95b14' 
  AND token = 'k4/5PRRQ51byW5PfzZVcPqVHmYZ823ZEiDqelLXQCP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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