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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0ca55330844c4316a2e82c9797e2e69f8df4f6c02dfc0c72cecb2942aebf3896' 
  AND token = 'nQtjsRB4ZKfGcfKz0bDRzOs82U3FbS4jesLnDPUvMzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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