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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '60f5a5ad01b3061a30f252e5ec2c3eb7e2532ad4bb5270ee450ba84daf1559e6' 
  AND token = 'YNFjWD0mLswXQMbOZ9C6cIBAiJHBkpY3lSbayoKeLYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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