Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc5750121e7b57a3d4a6eba3890f9c7664f09b852f577395fbb2a52cc2fcb340' 
  AND token = 'ChXi3sPKHWWv+Laa8rT195PAQZWBDgyuv5Vwd1kskTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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