Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf74e373d32462a4a3b2bd6d09ef687434dec512fccf85e129fd20b75f01962d' 
  AND token = 'caID1B2RlBgOUvKO79VR8msGDpnTKu+rU1P14JUumrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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