SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5aa7d00edeb47a190ae71589417143067565442c1e7f3614e346f949f722a98d' 
  AND token = 'PbGms8DXAFF9Mw1HywO+h11uN0T3YgkC2CpFSm0wqzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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