Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d685c20ae7ef9bd947dd206b3feb05fb2756c46f3ec8517a37af410eff3d546' 
  AND token = 'h0bD/qqFiDM4ygoMLQ+KSCadtq98n//g/+TE0lX5q7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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