Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b77fe23552027006383db0c00190d9e4f117865d64553afd0245d3c2292d5d' 
  AND token = 'L//5kUV9F9rlIaExRe6/rz3etY2+D5P0jfZbRA1Q6v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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