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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ce7c164d8475835b3c567035778dc5cd21d2280ea16cc6a61b925ae7440efa4e' 
  AND token = 'kpZZrdchqeeb4A1FbJaLBWqOi+HFpkXEd0hKcIk8W+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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