SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '899f3df5a7ea021ec8e2b9208c5bf3dc31e6f9164b62ba6d8e86606b7620c2fa' 
  AND token = 'SolrZv/fJQp5N45wVGtHVfB6G3IPs7gz/KkyLvjIGYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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