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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c0a400d1f31f36c103b3cdad96cc65bd0489e5ffce22a8c36f79783a68ccc109' 
  AND token = 'Q198LlKKtQO/ZdPxI9b/8QLl+OfNSquCY66Dc8VTTEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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