Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f2902b6f3630f996dabf6eb5946e699e10e1576c3805ee227d0688a7ec3cb0b3' 
  AND token = '24VVbBrNJM7T6Yq7QxoVO8w7Qu2+e7T3YbEJ72apBRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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