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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd4a9157727d517500e821f4c27ad19801fbd9aff7c77db032bc59d2f7ebe7297' 
  AND token = 'i/Valc0dxk1MoWSJ0WdlU4narEDMmIbwUpkZjWdErwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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