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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fa8535c6a58ad2846b727f02c7f6a59d0301cfab943e964933567b607a24dd63' 
  AND token = 'ld+stIFyk77ss8vKywltAxB0mbKQVTw3pIP2nae591s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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