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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cc573f2d93d48cd82834ff44ec27b82fb3894994db08a277dfbeff3a134fd645' 
  AND token = 'mgqdcn5h2VZx5RyyfC/lBhIldFmcgnV9tOsFQBvqOu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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