Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b2e2e3dfcead6731e8eaf7b462f0e07401c4f8796fccefc4d2e5e9bba4ec90' 
  AND token = '/qpDU0mGXCTDAlniIIGuxnk9JK1JSZ/txrcfPqE5+28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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