Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9a8c9f3d0c3953ee7d35dcb41b9bc148877eb1a9cb9f82b3090cf9627c3e99' 
  AND token = 'OHD3/RIAm0ZtnyzfrtQgHqNA+1Mc2mwLZ+TJXBstKMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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