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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3bd58ed7179ecf50958d1d0fc5307e6972f7dc71c9f704ab523abbdd4359d549' 
  AND token = 'yoDl9HPMClYq5VkgqDgx196JDDBPnwuLDdJ1aIKWu7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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