Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92576bd24de2ee1bf1c6a068c3ef497b2f1efe85fedcf8f4c350261b1c2cf0a' 
  AND token = 'cx91RLX8n+YiYpnfsZcc+Bq/XcftnP3xjUOKYVAOY9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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