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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8b26a865fb955463072e838b17e1eef0f0ab374bbbc6e076d077977a83e94a4c' 
  AND token = 'bdWnXQzIKtSlV18GsHyQApWEI7jlwJbBmgyxotK1y8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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