Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79447b456a40f48c90998a2f00253a1264be702cd7fa89512297f69d147acf9a' 
  AND token = '2kAq+8Uzb9/sLgaLrrZ72UQeEOOX4qswIKNvCOMTiwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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