Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfbe3f6b135902e4a18dea28cce9be165b2fe8ae7b9201cc0ae58f8cfe4e4ee6' 
  AND token = 'ch0OYkXTnX/uxbsbdCanlYxb7nimqaxHtzMnAavxoG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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