Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16abffc959e2cfb9b00d0fea2cfc5d37e6cb8f1fbbefb51996d0693226047ba0' 
  AND token = 'Ot82Pf9bg7iFcXPJpnE2esMw3ALNiqMcWCPbH86Q2HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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