Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f366ca6f78cf77d4541c83e438ed3950d5495e5d8900aac03052a83f3ccb8fdc' 
  AND token = 'wfhQSBQZ6IfAJuxyX1ET8rJKBWcjM2UW1wtQy+xR/Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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