Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a823a3fde29242b201e333faf235436bd777b082f3c4a7da8f9e8cb25cebc902' 
  AND token = 'Mz8xnUJINMXwPHmboHYJYjZ+ZXyF3vvJvEcrom8SnKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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