Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81b0f3c420cb651e516e40cc9adcf752a686ac5bf4c1fcd18896b074106ae38c' 
  AND token = 'uVreg9l41juhtPKfzGGr8h/DYBGfu2pOozEAcE5foPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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