Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38dd0b884d659a1cafde6aac2cdcea27cb301b455fccc243ddbba0d650810b86' 
  AND token = 'rFnkmYOwr/HzXDsUqXTfH3hFI36jYv9SddZPjLBcEJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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