Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec72c25edb2d3573ce13726a709425af3cfff288d436ada33745540306c1245' 
  AND token = '9wlpesVIliFGlJOOTEhG1PPbHEHrdDSXoLxrDV7U+eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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