Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9529bebb401d34ce99a064d5afe4c580baf46c8f63f2ced86ce81c965f86c2a' 
  AND token = 'Le553M1TvOOc5UYDCztvtYpjLTLjUsGYvoQfkHrR1Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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