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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f9d446960b0bf49bcb824fedc7536fe31cc22c8db50bd4483dddacd1aea57d1d' 
  AND token = 'd9mRc3XJ+8Uxy42R50gGk5RzMoMwxteE3pbFPWNhT9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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