Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c8921a35b7b7b6048fdd66e2a677335e796621d9960d1f32ae904eb892ee326' 
  AND token = 'cS0N1CNb4LBx0X23UJaWmZeoD0YBUZ3hk9+i2HzuPUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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