Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523fa7e6199c28c2783d4e2f69829b14370cdcb0b7fa0c68ea1e3d8263caddc8' 
  AND token = 'U3/c85ZlK7VdUePC19mEYFWDWPfC2HTT4XTQuPdgOg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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