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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b46745d40b9c50173c30be33c788b647a52b5becb286a6f76ff33ff16ccfa0d9' 
  AND token = 'VscaLe42I4MHbn4FO43FtoYL8emt8Qk/XoBH8uN+J90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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