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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3548f7f8f8aa7bbd45cc3293bb2e9cad513f1834188f5dab4671f5948f2558c3' 
  AND token = 'pxv6doHlftJxsOkVEzpnx5sI4DNZqSMo+OKcGSsrK1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01299

JSON explain

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