Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1931da26825d3c83f85d625990b62c4efc740db6c8c24cc9df706b97733be764' 
  AND token = '3Kay+sMpjEzIb9ITD7KItjt4ISF0u9+5iquSBr5JlaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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