Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a3ac36f556e762270e0bdcd366b0bc07ff2e937f691dbce00c4913fce6bb4cd' 
  AND token = 'dxiKMj2DQ5L9pYe2x4lVcC7bwyP83wrka2re+zTkYsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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