SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '487eb9c9fd4352f091a1c27d2166d005a7905fbb4b22b4d06c4b930683b1dbe2' 
  AND token = 'u7FznsGvQtsp+UKwPSv2dYDZ95WxQSxBwbOziIQPBZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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