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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '942625464d7a2c888ebb7af478f297c4df9642439018c7bb6f92f467763ace11' 
  AND token = 'hfPQtMvXmHkpjtl6TojuMhAXLMWq5UQwdR+fTK83stI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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