Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a39b8c307b32049f62cfa351b0e4f7edfb7c23919afcd99f221738e9a9959d9b' 
  AND token = 'bk4eLLktBFHx8qqBxq+cpsQ6TO+3gdhGCEPAcQg5y6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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