Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a960ed3d447807ba82679db142dcdf4752d28f3d48560f244e62b8d8f327deb' 
  AND token = '00D8b75LURfcWb+8s88clXixbiiXvOlEMNlGp6Y5YRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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