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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'eeceb25f95e3d46bb9adcf47fa9f0df36c46dd113b6c9cdae4939aa1c180ec64' 
  AND token = 'oE7fJHKQTltwglMPFWbbMDWp7/2DcDsDXC9bn72TFV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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