SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ad1f232374ef301aa495a84e39560661bbd905289f5445112e6e477a2e5f9b18' 
  AND token = 'zLFZF8utPKzVaY1XAhKX/Yip+Ow9PoQE2Orbqr1fRq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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