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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '09bc2e301768b66b0dfd891503f2d89923eeeacd5b6828328ed6359d9bc5e035' 
  AND token = 'fzJ3ho9B1wApnej426Wb7zv+OunnB4UwoRPeQSUTT/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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