Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b65fed8ffd75577f39db6d89f7fa00e9ce4e58f26819ed626471c4b8cf968089' 
  AND token = '5KjDqXsF3DsfePZtQTSSDgxDvETLYoP4xLPcfVETiwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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