Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c015961009133189e144ec6b6b16779d7f01c9c4517b553fd8d0d59eba883297' 
  AND token = 'e5z9zSptsYRJLg2rK9EHjc+3agmVXT3PgvTUn5EtEpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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