Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b024563afa2f3ffb244ee0625f1edbfee18780ea8a01fb41f291b5d9b5e6a71' 
  AND token = '6msYkB7mhZeaVFqaGVBOt9JV64dFvG/BC1HbWj6BkFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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