Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28039dae8274093ba243c43ac2ffdf873a989888f2c283ed986fbfa5f3fe2239' 
  AND token = 'Js88hBTH99kcLxCbroaNaTNlTeCUEE15DF/bDN76b2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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