Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '027a08dda327c0ffd05eb93d2d0a5debcb4fad1c89588b44d0147b83cc9c5901' 
  AND token = 'nEdb/xw6INQ5IkEP0guiZwlc6zSkB9TsL8FX1FRXluo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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