Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc39fbb29b25fc695de0c13c1587f73aacaa3751f774a2ca7143c7652c9cbaa' 
  AND token = 'i6T5IeKnJFBNi5vlBOOV7RQ+qQ4YSH6lA0lKshyXKb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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