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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3603d4b6127271e21a4996963c720e8ae6ea81c94cef5694da02876aae8aaea0' 
  AND token = 'lnaZJlDS03L6il9jIZ2ytknllp6nAuO1sENWkl1LpIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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