Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b7d5f9f91a5278d3b651dabddd1c4f405ad7e1b06b3e9bea23619530b20e5ab' 
  AND token = '9i8khWvudrUCtkPya13XeqJB935FEa9pabamqkwXgcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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