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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b2de1841c9ca648e387f6ec20221ae02144cba42114c57a1afb389e6fbab9384' 
  AND token = 'j+SvgYlqnp1SJGp09kvtk3xOEboSO2tRksnPoEzN0cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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