Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ea7fa9ec02c020ca303dbb19d8c2ca32fbd394dcd0a980eb90ea94f1f044d1' 
  AND token = '0BejJg4OXfIWFocqipKxsU0NrqI3nCCUMmdiN0aeZ7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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