Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '08b8332f95b6ba3aa5ecd21b78fc10280beba043bc2f2808862ae4140e97048e' 
  AND token = 'Nl7Vj4kTvy9qyPyzKepKDZ9dVE1/WZXWSHe9U/W7ODQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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