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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8a60a503d28f4b527a769b0ad265ea6ec52501b42080cb443d4fa705fe3ea0fc' 
  AND token = 'Ask2OWX6eEqyLFuG6IsqSYbON+zGcNE+77GOLBalYXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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