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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4c4cf8bf38c3f92b96bd3ed27dd388736f7bb8023c81bde0fb8eed442b89714f' 
  AND token = 'h6GxHz0XHYlyqnrEixDq1gqu1PtzS3orpa/1aFe10fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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