Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '123f8fcef571ce0a206be22826196fe357470920ab766087048368bb7fd7a7fc' 
  AND token = '9cU7qhO82UmkeFrlU/UEzQRuZqSx59XmQ2HVShZ74io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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