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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1d229bb97a402f6e9f249eefe95966da736babad9e6335dd1cb36a9362555ab4' 
  AND token = 'eo931iICVvUS8OH1ZngSXfCo2B4tWsLCacptm/Nk0nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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