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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6f34387923e1cea04dedcf4e1e195eb20f6fc9e5fcdc52f54a55283ea358d15d' 
  AND token = 'YUcm46nCmj3j5GTpKjy627kd4lusLL4EJIsAnT7thwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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