Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be66eecdda2f2fa8a7dbee8e306ab848d1e40427257cfa7d8cb97513dbad517b' 
  AND token = 'XDwyAZOqqbl/TGaNlqkuvxS4TR1epWtUR0bW6B+KcBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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