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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '533a0fe5f801c29778ab9c8b2325f9bdb2faac21f145bedebfb16cea2f4a9330' 
  AND token = '0UK9+JiS7mpARgPT7rUyeyvvwOyWJ56C5poVHYrSVPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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