Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cb80ccfedcb20869a58639e28ec69d8d931442250e098d3cce126b3a2c7d12a' 
  AND token = 'HfRyChIUbKr4FMxmuR7elxLTgvfritsYWcAWiZsn+9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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