Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6c8cd18eb7b24a54b23df5420b0ce97c6fc49f1097a91c21d6a613f2c4356df' 
  AND token = 'EKgaSBfLyNdQCpGUPt4SaM9qGQ9Ngwz+Pz/xiNsbkcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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