Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e5f76cd32cab20524824b2df6e2ba0e7a9e5a41bf691cb173e750202f7c99bf' 
  AND token = 'F5Y7/Lii9qtBkE/+FQPChbFOOEdX/JPNuUQFHDO82k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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