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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b9e862b849dd4164dffd79a4494eb6d7789d1e5f7335b53d5f1dd3e14cacbdfa' 
  AND token = 'yqQ43SnJSLTW+6i+EzUrftRdb6gbd9mc8gK5nCo9KJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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