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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9f860da931c0654e9962ece72fe59c38435ccbe66d430759e354802ee9f2b441' 
  AND token = 'bedFUPMI0EpqVJ7RacuFmZZTxYncXufzjx0u8CrbsOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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