Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4fb09b18406c756838a68ffa6a12e624a62bce553e28f6958e7cfd3559e43f11' 
  AND token = 'G+Jey5gh37enOp+8Ob614Af17taSlKu4E82AFBpcYcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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