Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39040779f51b724df8cbeea061cd96310705d437611d77d89a56b956cf0372ca' 
  AND token = 'gv0ssA/W66xNpkiYknEiMd2LeIN5swxZ2L6OZit/2d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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