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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '38f6b4e15d4c566e7a4a70a161a459ddb4f081da3eaaa71c54fa6f0edd631c24' 
  AND token = 'TExs30dAQpd4vom3RJP6RNXUlkySiQJyq/yfC2WlGMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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