Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38804fc9133f2dab80544c059b6646943d9c0c4cb93230f9ced1cf94f668d31c' 
  AND token = 'K9JfrAHXDmOaKlag7vrEqHDypMghUnXvvdyMxEW5Jvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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