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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9ae721ff8e76a7ae5417a72b2c376ece18624d3edb779e99a6460af5f1d9a321' 
  AND token = 'FdOAhYwr1EexzLFXNSzVyi5AJ1K8wHOiv5D0F7pS1t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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