Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec2937294f45ed0b07e9098db2a39a23748043d8e5bd9b7846034002ebcc0f12' 
  AND token = 'mDZJWZ3fOnqUHDfwczTa05q/6Z2sRJV+Whs+E74tYWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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