Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2df0203ba06ea1883e5e52d136f2182e3b38955bd271e00ad99566cea010d974' 
  AND token = 'snRpca9JxAci/14exwnl/thrPrsHzB3TxU3wE71iAgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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