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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd9cf1c67c87c6fe092b5d6f137406fca01df1accf765bcc4674607ac7dd2294d' 
  AND token = 'h7NE9T07bNmU1wo/9qFsfmPvqZ5AqZwvWqJGAHErV04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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