Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf983e0b8d68e72a0beb895ee945375fddfb649a62c6a4cea292e1a5f1756e87' 
  AND token = 'n6TU3rnT6YPmq96y3ZAiYWM+/OXXWnWaKNyU9oJJUEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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