Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26aa65ad17910907a8cac3861893fa2658f94f7d79cc61821035bf9665c8ba9' 
  AND token = 'snjBl67ny8jchXZzCud2AnO9cgAGrxq7j1pi0Kn4SDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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