Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0c47c3a3f8fc4d5c57bcb0ce2f1bc5173c3c59ba925d7dcbfc640915650ca0' 
  AND token = 'Ag+BGOvnRRCowSpLyhtdbDjZkfHewW5HY9T/2rQ1CNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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