Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '341b7310eace164be8c429a3d3e6417182430eaff3ee4981ff47ec37dd0e4a70' 
  AND token = 'a81KyuFHShC0g8REcnQ+EA8bJK2NuvphPFw5MzSyiUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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