Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91356e51767deb438a070563da14032528c04cee414338a9fc4d8ac2abc35f84' 
  AND token = '2V56/sac2igpzuuZgDZUV9Wa/C4oPlpUOaZq6ubmkWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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