Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a6bf019cbffbe442c4d689d160ef41797883cd32ce375bc0e5c9f5bb54757ff' 
  AND token = 'rsqpYEXCAtIl8EovmsoHFHo+y13lnzZ0l6F+mb4XLhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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