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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9650d9ccfd753689844c12b461368667bd8c644dade4a73404f5769a844e21fc' 
  AND token = 'MgMnWVfCJP3bT15Txc3ngDuzCuT8X3qnqie02uYZTQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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