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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '835b1b0149411c549c270482c6a5daa0b041c4cc1440993b5e6ec410bb3834be' 
  AND token = 'bfAuPRrLTVRHuHbh/qAwl1lxBm5gmbG+ddGj2twhFao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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