Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc6af504f33db37cec0b2581f6e73b0fe1b81718121ecf88660c87652c5238ad' 
  AND token = 'c02pAe644p0iNtwjcBJABY0XtvDV8fKwU35mAGZsiRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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