Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd42a231321dcbd1b6ff1ee9e84e0433dbfac016f76c4fbbfc29770bed83ba5' 
  AND token = 'LtE54TvPZXCaLhPS2gG5YJBP8Y0aEbu8f8PJSlmDykA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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