Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c777268225e7a6d0359ab272ca83e0a1af61e4fd26766526023b58c857ba6f1' 
  AND token = 'ckCCODxudBI2SmR5hbaDEf4T87k40q5tdCDkLt77aco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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