SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1b65b84a0f84e7ff4d1b6d55f070a4dc30ea1f278202c87eb9612c6669a6b89c' 
  AND token = 'VXyV1pLlPspwGHKinPlqY31nX2HtZSaRQn+PjQL/ghw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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