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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b4a600a677cdf229d52d01fbc3fe2eb6a61656140de69649fd78eac8e0c981de' 
  AND token = 'eVZWBN4pufbzNC8xE1GaAgPxJaHfC9jXE80GlfyPhXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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