Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12b48f22db011d72acbbc177e97b2d68035b3e39a40fa10a51ef891931cde0e1' 
  AND token = 'WGMS2uBj0JcnKMr/vCUkaUrExDiYz8X1QoDWdWhma2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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