Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7b5ebd98302f470bd9328f0e95cfb05bb9591ac50aed7209386fd3a861fe0b' 
  AND token = 'P5Kc2cOnCOKRTRnfO50BIyUBmhZDXegTUYaTUy3EbR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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