Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51c2923f942aae27d1a8d7d5598261920d24b15bc066a245c693bfee4714fde0' 
  AND token = 'boy4ScZyP/bIIIyyLvqoTA/WeGd4F+PrZXtx2FCroZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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