Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e86c420799ef6a5037d054e08565fe9420318833fe992e12e2f98a7e0a6a9521' 
  AND token = 'IebAspIcD8T0v9hl46IGgIQDa4kr9VT1vAcE61i/xsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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