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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a9ee8d94163b1b9f742a40e9e2150dc47aa65f71abc4e30101af18ab034b7c37' 
  AND token = 'jmnpnmLrU+JqEfRbDi8BBUYWSZRXRgCe9sSGRy16HB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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