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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3504d1217654b7c45f7720e8a8be10811eafc231e1db5e68cdd10107a4854d23' 
  AND token = '31tu2zS9PMvHsXfgstVbSgzOFLgCKxNkTvcBOXKyY2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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