Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2990a5e865baed79db004367a70f0ca39fb75c1e3cf33cf5f1f483a378cc1542' 
  AND token = 'uF9oQ1GfzsTkahzy3gB1zbHsd1e0id6zlcKj/z+uhL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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