Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e760cce2db8a6c0a25eebd290eb1f203c980d4d140eb7b9b5a34b299a4fcea4' 
  AND token = 's6Tt7TQsS/KvBWBVv7ER/jjoaglcTir+v0VkmzO8oSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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